From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Fri, 1 Feb 2019 15:15:22 +0100

In sctp_sendmesg(), when walking the list of endpoint associations, the
association can be dropped from the list, making the list corrupt.
Properly handle this by using list_for_each_entry_safe()

Fixes: 4910280503f3 ("sctp: add support for snd flag SCTP_SENDALL process in sendmsg")
Reported-by: Secunia Research <redacted>
Tested-by: Secunia Research <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Applied and queued up for -stable.